Understanding tempfile.TemporaryFile

[byte8bits at gmail.com]

Wondering if someone would help me to better understand tempfile. I
attempt to create a tempfile, write to it, read it, but it is not
behaving as I expect. Any tips?

>>> x = tempfile.TemporaryFile()
>>> print x
<open file '<fdopen>', mode 'w+b' at 0xab364968>
>>> print x.read()

>>> print len(x.read())
0
>>> x.write("1234")
>>> print len(x.read())
0
>>> x.flush()
>>> print len(x.read())
0